| |
| |
| Obligatory
finesse |


|
| Odd-even
discard signals |


|
| Oden rule |


|
| Offside
double |

|
| Ogust
rebids |

|
| One
diamond negative response to one club |

|
| One
Notrump rebid |

|
| One
Notrump response |


|
| One
Notrump response to major, forcing |


|
| One
Notrump response to minor suit |

|
| One-over-one
response |


|
| One-two-three
pre-emptive |

|

| Opening
one notrump bid |

|
| Opponents
suit |

|
| Optional
double |

|
| Out on a
limb |

|
| Out-of-the-blue
cuebid |

|
| Overcall
in opponents major suit |


|
| Overcall
in opponents minor suit |

|
| Overlead |

|
| Overruff |


|
| Overtake |

|
| Overtrump |

|
|
|